Pressure regulator for pumps



Aug.- 26, 1930. F. A. HANSON ET AL I PRESSURE REGULATOR FOR PUMPS 2 Sheets-Sheet 1 Filed Dec; 23, 1926 Aug. 26, 1930. F. A. HAN ON El AL 1,774,001

' PRESSURE REGULATOR FOR PUMPS Filed Dec. 25, 1926 2 sheets-sh et 2 INVENTORJ 7 of a ATTORNEYS 10 pump: of its load when such v. clisoharge' notoriously difficult to keep in good conch-- Patented Aug. 26, 1930 11mm A, HANsonAnn FRANK L WIS; OF Sim 'o'sE,

c iiimonnm', Assignees; in:

"MYESYNE ASSIGNMENTS, T noonMAC IN R poni on i'rion, oF-sii'n qosn oAIjI invention i-rel tes' to pressure regiilators 'es peeially. adapted for rise .in connection with continuolislyoper@ting having a plurality of Cylinders ii-T prin pa ,d je t preseure at the diseherge and to, relieve the sure rises to e predete'rmined maximum. Our

invention permitsthe use of extremely Sin pl e.mechonismflegarclless of thenumher of oyliii e s ih ip mp, nd fl q ff s '15 extra val'ves,

v the ii'suel Cylinder fdisoharge valyes faeting' to retain the fluid press re "in the discharge "condp'it system, and the, usual;

inlet Fakes being F m unloader alves; in 1a mannento .be described hereinafter,

Another object of'the invention-[is to proide a. oonvenient'rneans fordraining the 0311-" inders a ncl' intake passages of liqu d supply A further object is to providerneans for'aii tomatically flushing and cleaning-the strainer in the pump. intake. Still other'objeets and. adyant lg S Will be apparent fro'm'the follow Y ing'tlescription of altypical forni of plirnp embodying theinvention. 9

' I r invention s ofespecial valuein conmotion with pum s. adapted to supply fluids finder high pressure, and particularly ,liqliide of a. corrosive nature such asflthosef some-v tiines ,griiployed in [insecticide spraying;

tion; the great, presure and velocity of the liquid, eVenWhen not ohemicallj corrosive; acting to wear and out the" faees of the "Valves and their seats. 1 The elimination of extra valves inxsuoh apparatus not-only reduces-.thezfirsticostybnt also materially reduces'the cost of: mainte-- nance and the ,timeinecesisary; foryreplace ual'valves of the several eylinders insteadof providing qne valve or a set of valveseom monto all Cylinders forfthe regulating functions, our invention divides the work and the Wear consequent thereto among all the Valves,

(if our invention is to 1 provide aa pressure fregulttor' which rnak'ee u sefof theiisual inlet and (iisel arge,Valizes of the pumpcylinders td control the fluid,

pmnp s', 'to f prevent or freezing in eold Weather;

merits. Moreover, by ntilizing the.inclivicl- FORN A', AooRionATIoN or ELAWARE jp pli cation liiled December, 23,' 19j26,- $eria1 in}. seezel g f V sothat th ga l pon enyone'i elireisfl'cioinparatiyely. slight.

donojt wishito' he: iiiilierstgiod is 4 tri ng pouri v n icnib pmnp xus e f r.

thefpurpose nentionedfaboveiby W ziy of ex} ample for t may also be-used; to :aidvantege in v connection with afiy rni lti-oylinder It is also tobhriclefstqgid thtt theforini 'con-, struction {and arrangement -of the several parts the apparatus herein described and, illustrated 1 "be Varied}; Within the limits ther claiins' hereto appende'id, withg fl a p rting; from the'sp'rit ofl'theinv'eiition' its; set forth in'said 'clairns'. W thth1s in iew; ourinvention will now a mp,cp i ns.,of our. gr s fgulatorjbjei g' show (Minted 77p nines. ,7

Fig; 'is ai seotionion the of 1". Fig. 3 is' a section 'on theline of Fig, 1." In thefdra-wings, the reference numeral 1' designates the base'membe'r of'a purh'pl aving,"'a" plurality of eylinders '2', three sueh incler" is understootil to hex e "a; s'iiitableflpistOIl, one of which is shamans-.12; ,{Ehe pis on b s ed to he dp'e i ii the usual manner by connecting rods and "a 'er nk s aft, not S n; t e c an "off which .120, degrees epert'."

.' Each" 0. 'linder 2 has an inlet valvel l tindji I diseharge Valve '5. These valves shown is ball cheeksfhaving the respective seatsffi A and 7 and" operating in chainberslQl? ,CrlgslS and 9,. ii' h e ruetf onfi's well known in dii s a' l f n fs id m fol a pipe, llglFigl 35m n. l a i ny d sire P nt. for C ndu t? ng he fl id. i he d y th pump- 'i T e ke thesf vm cy er h e; Similarly fli g, the e f lfing fi bf t 'IQLI-J f The ot- Qf' sin! intak m nifold "f rmed as a sep able p n? 1 F g 2 and- 60' L hi h the fluid entersat 14 frorn'the'source 'oflsnjo' P y, o n: The pan" 1 1 p e erab y theart.'" A'disoharge'conduitor inanifold 10 v easily accessible for cleaning or replacementby the removal of the pan 13. It is also automatically cleaned by the back flow of the fluid when the inletfvalves are opened by the regulating or unloading mechanism, as will be described hereinafter.

- The discharge manifold 10,.terminates in a flange 17, Fig. 3, to which is secured, by any suitable means, not shown, a chambered cap extends the entire length thereof- At one ing 27and a manifold 12.

18, the discharge pipe 11 leading from said cap as shown. A flexible diaphragm 19 is clamped between said cap and the flange 17, and is exposed to the pressure of the, fluid within the discharge manifold fa-nd pipe l1. .A plunger 20,9slidable in a guide way 21 formed in the lower'part of the flange'17, bears'against the outer face of the diaphragm, and is backedv by a spring22." "The plunger has a stem 23ioperating in aguide 24f secured to the basel A rod 25 is a'djustably secured, as by a threaded'connection 26, to

said stem, and extends through suitable pack- An oscillatable member QQis mounted upon a shaft within the intake manifold 12, and

pointin its length, said' member is provided 'witha shoulder 31,]3ig; 3, against which the end of the diaphragm plunger rod 25 bears.

The member 29 has a plurality of laterally extending curved arms 32, Figs. land 2, one suc'h'arm being positioned withits end ber i neath each inletvalve 4. Therefore, when '40 the plunger rod 25 is moved toward the left, by the action of the diaphragm11'9, the member 29. is rocked, and its arms. 32 lift all the inlet valves off their seats. 7 1

The operation of our pressure regulator will be apparent. When the parts are in the positions shown in the drawings, the pump functions normally, drawing in the fluid from the intake manifold 12 through the valves 4,

; and expelling it through the valves 5 into the discharge manifold 10 andpipe 11, which are parts of the discharge conduit system. When the pressure in said discharge manifold and pipe rises, to the desired maximum, the ,dia-

: phragm 19 forces the plunger 20, stem 23 androd 25 to the left against the compression of the spring 22, thereby rocking the member 29 and causing its arms 32 to lift and, so long as the pressure continues, hold the inlet valves l'ofi' their seats. This relieves the pumpof its load and causes it to cease pumping into the discharge system, but the discharge valves 5 retain the fluid, pressure in the discharge 'manifold 10 and pipe 11. Then when. the

pressure drops, the spring'22 returns the plunger 20 to its normal position, and the guide bushing28 into theintake h three cylinder pump, for example, at least member 29 is rocked back, by the weight of its arms 32, thereby allowing the inlet valves to seat and operate normally.

It is to be noted that the leverage of the valve lifting arms 32 is such that onlya very slight movement of the diaphragm 19 is sufficient to produce considerable lift of the valves This is of advantage in reducing quickly the pressure and velocity of the fluid passing through the lifted-valves, thereby reducing wear upon said valvesandtheir seats. Another factor which contributes to the long life of the valves and seats is the dividingup of' the unloading function among a number of valves. The amount of highpressure fluid which passes through any one valve at the instantlof opening is much less than would be the case if a single valve were used to unload all cylinders, and-the pressure and velocity of such fluid is reduced correspondingly quicker. The discharge valves are also relieved of considerable use and wear,

because during the time in which theinlet valves a'reheld open, no fluid is being pumped through said discharge valves, which remain seated. p 1 Moreover, not all the cylinders are working agamstpressure at any given time. In a one and sometimes two'cylinders are working on the suction stroke at the instant "of unloading, s'o'that only the valve of the remaining cylinder isopened against high pressure.

Since all the inlet valves are opened by the J rocker member 29, only one, or at the most two of saidlva'lves are subjected to the pas sage of fluid at high pressure and velocity at any one unloading operation.

In three cylinder pumps, in which either one or two inlet valves may be subjected to high pressure at any given instant of time, it is desirable to make the rocker member 29 in such a manner as to cause it to open the valvessuccessively, rather than exactly simultaneously. By this means the discharge pres sure, acting uponthe diaphragm '19, must, at each unloading operation overcome the cylinder pressure upon only one inlet valve at a time,instead of sometimes two, as would be the case if theIrocker member 29 opened cient interval can be secured, in practise, by 130 grinding off the ends of the arms 32 to slightly different lengths, or by any other equivalent means.

In two or four cylinder pumps, in which the same number of inlet valves are always subjected to full cylinder pressure, the open in coldweather, is accomplished merely by,

shutting ofithe discharge system at the nozzle or other delivery apparatus, not shown, and allowing the pressure to build up to the unloading point before stopping the pump. The inlet valves 4 are thus held open after the pump stops, and the liquid drains fromv the cylinders and inlet valve chambers backthrough the manifold 12 into the-supply tank or to any other suitably provided outlet, not shown. Such draining 0f the cylinders is rendered possible, of course, not only by the holding open of the inlet valves by the pressure actuated devices, but also by the relative positions of the cylinder, inlet valves, discharge valves, and inlet manifold 12,- said inlet valves being at a lower level and the discharge valves at a higher level than the cylinders, and said manifold opening upwardly into said valves, so that all can be readily drained, preferably through one out.

let; This draining operation requires much less labor and time-than the usual practise of opening the 'inletfvalve cages and lifting the valves by hand. The liquid in the dis-- charge valve cages and discharge system can be drainedout inthe usual way through the pipe 11. v

. A still further advantage of our invention resides in the automatic flushing or cleaningof the screen 16 referred to above. Whenever the inletvalves are opened by the described pressure controlled mechanism, the fluid is alternately drawn into andv forced outof the cylinders through the'inlet valves and ing formed as an elongated chamber; a removable bottom cover for said chamber; a

screen extending across said chamber above said bottom cover; means for conducting' fluid into said chamber below saidscreen; a member mountedm said chamber above said screen and having means adapted to open the mlet valves; and means responsive to the c pressure of the fluid in said discharge con duitfor operating said member. 1 2. The combination with a pump having a plurality of cylinders each provided with an inlet valve and a discharge valve,"of inlet and discharge conduits common to said cylinders and positioned on opposite sides thereof; an

oscillatable member mounted within the in-' let conduit and having arms adapted to one gage and open the inlet valves; movable means mounted in the discharge conduit and responsive to the pressure therein; a rod extending between said conduits and connecting said oscillatable member and said pres-. sure responsive means for movement 1n one direction; and a sprlng for movingjsaid rod in the other direction.

In testimony whereof we have signed our.

names to this specification.

I FLOYD A. HANSON.

i FRANK H. LEWIS.

the screen, and this back flow of fluid through said screen effectually washes off any sediment adhering, to its under side. As the unloading. operation normally occurs at ,fre-

qu'ent intervals, the screen is kept 'clean, the o sediment settling into the pan 13 fromwhich it may be removed easily when necessary.

We claim 1. The combination with a pump having a plurality of cylinders each provide-dwith an inlet valve and a discharge valve, of inlet and discharge conduits common to a plurality of said cylinders, said inlet conduit be- 

